Mobile rotary drill rig



FIG. 1 is a right front perspective view of a mobile rotary drill rigshowing our new design;

FIG. 2 is a left rear perspective view thereof; and

FIG. 3 is a top plan view thereof.

The broken lines showing of the engine in FIGS. 1 and 2 of the drawing,is for illustrative purposes only.

The ornamental design for a mobile rotary drill rig, as shown anddescribed.